Update using-executorch-android.md (#10085)

scripts/build_android_library.sh will no longer build demo app.

Need to update
https://github.com/pytorch/executorch/blob/main/examples/demo-apps/android/LlamaDemo/docs/delegates/xnnpack_README.md
then.

Co-authored-by: Hansong <[email protected]>

Author: pytorchbot

docs/source/using-executorch-android.md

@@ -96,8 +96,7 @@ Now you can compile your app with the ExecuTorch Android library.
 
 ## Building from Source
 
-`scripts/build_android_library.sh` is a helper script to build the Java library (into .jar), native library (into .so), and the packaged AAR file. It can also build
-demo apps to showcase the AAR is integrated into a user app correctly.
+`scripts/build_android_library.sh` is a helper script to build the Java library (into .jar), native library (into .so), and the packaged AAR file.
 
 You need Android [SDK](https://developer.android.com/studio) and [NDK](https://developer.android.com/ndk/downloads) to use it.